161 lines
5.6 KiB
C#
161 lines
5.6 KiB
C#
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#region License Statement
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// Copyright (c) L.A.B.Soft. All rights reserved.
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//
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// The use and distribution terms for this software are covered by the
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// Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
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// which can be found in the file CPL.TXT at the root of this distribution.
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// By using this software in any fashion, you are agreeing to be bound by
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// the terms of this license.
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//
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// You must not remove this notice, or any other, from this software.
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#endregion
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#region Using Statements
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using System;
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using System.Collections.Generic;
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using System.Text.RegularExpressions;
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#endregion
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namespace Textile
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{
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public partial class TextileFormatter
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{
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#region State Registration
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private static readonly List<Type> s_registeredStates = new List<Type>();
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private static readonly List<FormatterStateAttribute> s_registeredStatesAttributes = new List<FormatterStateAttribute>();
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public static void RegisterFormatterState(Type formatterStateType)
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{
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if (!formatterStateType.IsSubclassOf(typeof(FormatterState)))
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throw new ArgumentException("The formatter state must be a sub-public class of FormatterStateBase.");
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if (formatterStateType.GetConstructor(new Type[] { typeof(TextileFormatter) }) == null)
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throw new ArgumentException("The formatter state must have a constructor that takes a TextileFormatter reference.");
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var att = FormatterStateAttribute.Get(formatterStateType);
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if (att == null)
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throw new ArgumentException("The formatter state must have the FormatterStateAttribute.");
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s_registeredStates.Add(formatterStateType);
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s_registeredStatesAttributes.Add(att);
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}
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#endregion
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#region State Management
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private readonly List<Type> m_disabledFormatterStates = new List<Type>();
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private readonly Stack<FormatterState> m_stackOfStates = new Stack<FormatterState>();
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private bool IsFormatterStateEnabled(Type type)
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{
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return !m_disabledFormatterStates.Contains(type);
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}
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private void SwitchFormatterState(Type type, bool onOff)
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{
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if (onOff)
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m_disabledFormatterStates.Remove(type);
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else if (!m_disabledFormatterStates.Contains(type))
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m_disabledFormatterStates.Add(type);
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}
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/// <summary>
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/// Pushes a new state on the stack.
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/// </summary>
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/// <param name="s">The state to push.</param>
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/// The state will be entered automatically.
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private void PushState(FormatterState s)
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{
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m_stackOfStates.Push(s);
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s.Enter();
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}
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/// <summary>
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/// Removes the last state from the stack.
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/// </summary>
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/// The state will be exited automatically.
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private void PopState()
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{
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m_stackOfStates.Peek().Exit();
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m_stackOfStates.Pop();
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}
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/// <summary>
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/// The current state, if any.
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/// </summary>
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internal FormatterState CurrentState
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{
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get
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{
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if (m_stackOfStates.Count > 0)
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return m_stackOfStates.Peek();
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else
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return null;
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}
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}
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internal void ChangeState(FormatterState formatterState)
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{
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if (CurrentState != null && CurrentState.GetType() == formatterState.GetType())
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{
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if (!CurrentState.ShouldNestState(formatterState))
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return;
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}
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PushState(formatterState);
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}
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#endregion
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#region State Handling
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/// <summary>
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/// Parses the string and updates the state accordingly.
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/// </summary>
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/// <param name="input">The text to process.</param>
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/// <returns>The text, ready for formatting.</returns>
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/// This method modifies the text because it removes some
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/// syntax stuff. Maybe the states themselves should handle
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/// their own syntax and remove it?
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private string HandleFormattingState(string input)
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{
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for (var i = 0; i < s_registeredStates.Count; i++)
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{
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var type = s_registeredStates[i];
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if (IsFormatterStateEnabled(type))
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{
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var att = s_registeredStatesAttributes[i];
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var m = Regex.Match(input, att.Pattern);
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if (m.Success)
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{
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var formatterState = (FormatterState)Activator.CreateInstance(type, this);
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return formatterState.Consume(input, m);
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}
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}
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}
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// Default, when no block is specified, we ask the current state, or
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// use the paragraph state.
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if (CurrentState != null)
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{
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if (CurrentState.FallbackFormattingState != null)
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{
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var formatterState = (FormatterState)Activator.CreateInstance(CurrentState.FallbackFormattingState, this);
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ChangeState(formatterState);
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}
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// else, the current state doesn't want to be superceded by
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// a new one. We'll leave him be.
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}
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else
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{
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ChangeState(new States.ParagraphFormatterState(this));
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}
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return input;
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}
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#endregion
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}
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}
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